Multi Layer Combine Filter Design Using Suspended Substrate Stripline Topology

Introducing a novel structure for a narrowband combline bandpass filter with Chebyshev's response. This filter is comprised of two discrete physical resonator configurations: microstrip and suspended substrate stripline, both accommodated on a single-layer substrate. The in-band insertion loss is observed to be minimal in simulation, attributed to the inclusion of four high-Q stripline resonators, while the introduction of two microstrip resonators facilitates the attainment of transmission zeros. This strategic design augments selectivity and affords the possibility of integrating the filter seamlessly with other components within the system. The passband covers a frequency range of 2. 1 to 2. 7 GHz. Preliminary experimental results obtained from Advanced Design System (ADS) are provided to authenticate the design approach.